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Apache Geode provides a database-like consistency model, reliable transaction processing and a shared-nothing architecture to maintain very low latency performance with high concurrency processing
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/*
 * Licensed to the Apache Software Foundation (ASF) under one or more contributor license
 * agreements. See the NOTICE file distributed with this work for additional information regarding
 * copyright ownership. The ASF licenses this file to You under the Apache License, Version 2.0 (the
 * "License"); you may not use this file except in compliance with the License. You may obtain a
 * copy of the License at
 *
 * http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software distributed under the License
 * is distributed on an "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express
 * or implied. See the License for the specific language governing permissions and limitations under
 * the License.
 */
package org.apache.geode.management.internal;

import java.io.IOException;
import java.util.ArrayList;
import java.util.List;

import org.apache.geode.distributed.internal.ClusterConfigurationService;
import org.apache.logging.log4j.Logger;

import org.apache.geode.CancelException;
import org.apache.geode.SystemFailure;
import org.apache.geode.cache.Cache;
import org.apache.geode.cache.CacheFactory;
import org.apache.geode.cache.GemFireCache;
import org.apache.geode.cache.execute.Function;
import org.apache.geode.cache.execute.FunctionContext;
import org.apache.geode.cache.execute.FunctionService;
import org.apache.geode.distributed.DistributedSystem;
import org.apache.geode.distributed.internal.membership.InternalDistributedMember;
import org.apache.geode.distributed.internal.tcpserver.TcpHandler;
import org.apache.geode.distributed.internal.tcpserver.TcpServer;
import org.apache.geode.internal.InternalEntity;
import org.apache.geode.internal.cache.GemFireCacheImpl;
import org.apache.geode.internal.logging.LogService;
import org.apache.geode.management.AlreadyRunningException;
import org.apache.geode.management.ManagementService;
import org.apache.geode.management.internal.JmxManagerAdvisor.JmxManagerProfile;

public class JmxManagerLocator implements TcpHandler {
  private static final Logger logger = LogService.getLogger();

  private GemFireCacheImpl cache;

  public JmxManagerLocator(GemFireCacheImpl gfc) {
    this.cache = gfc;
  }

  @Override
  public Object processRequest(Object request) throws IOException {
    assert request instanceof JmxManagerLocatorRequest;
    return findJmxManager((JmxManagerLocatorRequest) request);
  }

  @Override
  public void endRequest(Object request, long startTime) {
    // nothing needed
  }

  @Override
  public void endResponse(Object request, long startTime) {
    // nothing needed
  }

  @Override
  public void shutDown() {
    // nothing needed
  }

  public void restarting(DistributedSystem ds, GemFireCache cache,
      ClusterConfigurationService sharedConfig) {
    this.cache = (GemFireCacheImpl) cache;
  }

  @Override
  public void init(TcpServer tcpServer) {
    // nothing needed
  }

  private JmxManagerLocatorResponse findJmxManager(JmxManagerLocatorRequest request) {
    JmxManagerLocatorResponse result = null;
    if (logger.isDebugEnabled()) {
      logger.debug("Locator requested to find or start jmx manager");
    }
    List alreadyManaging =
        this.cache.getJmxManagerAdvisor().adviseAlreadyManaging();
    if (alreadyManaging.isEmpty()) {
      List willingToManage =
          this.cache.getJmxManagerAdvisor().adviseWillingToManage();
      if (!willingToManage.isEmpty()) {
        synchronized (this) {
          alreadyManaging = this.cache.getJmxManagerAdvisor().adviseAlreadyManaging();
          if (alreadyManaging.isEmpty()) {
            willingToManage = this.cache.getJmxManagerAdvisor().adviseWillingToManage();
            if (!willingToManage.isEmpty()) {
              JmxManagerProfile p = willingToManage.get(0);
              if (p.getDistributedMember().equals(this.cache.getMyId())) {
                if (logger.isDebugEnabled()) {
                  logger.debug("Locator starting jmx manager in its JVM");
                }
                try {
                  ManagementService.getManagementService(this.cache).startManager();
                } catch (CancelException ex) {
                  // ignore
                } catch (VirtualMachineError err) {
                  SystemFailure.initiateFailure(err);
                  // If this ever returns, rethrow the error. We're poisoned
                  // now, so don't let this thread continue.
                  throw err;
                } catch (Throwable t) {
                  SystemFailure.checkFailure();
                  return new JmxManagerLocatorResponse(null, 0, false, t);
                }
              } else {
                p = startJmxManager(willingToManage);
                if (p != null) {
                  if (logger.isDebugEnabled()) {
                    logger.debug("Locator started jmx manager in {}", p.getDistributedMember());
                  }
                }
                // bug 46041 is caused by a race in which the function reply comes
                // before we have received the profile update. So pause for a bit
                // if our advisor still does not know about a manager and the member
                // we asked to start one is still in the ds.
                alreadyManaging = this.cache.getJmxManagerAdvisor().adviseAlreadyManaging();
                int sleepCount = 0;
                while (sleepCount < 20 && alreadyManaging.isEmpty()
                    && this.cache.getDistributionManager().getDistributionManagerIds()
                        .contains(p.getDistributedMember())) {
                  sleepCount++;
                  try {
                    Thread.sleep(100);
                  } catch (InterruptedException e) {
                    Thread.currentThread().interrupt();
                  }
                  alreadyManaging = this.cache.getJmxManagerAdvisor().adviseAlreadyManaging();
                }
              }
              if (alreadyManaging.isEmpty()) {
                alreadyManaging = this.cache.getJmxManagerAdvisor().adviseAlreadyManaging();
              }
            }
          }
        } // sync
      }
    }
    if (!alreadyManaging.isEmpty()) {
      JmxManagerProfile p = alreadyManaging.get(0);
      result = new JmxManagerLocatorResponse(p.getHost(), p.getPort(), p.getSsl(), null);
      if (logger.isDebugEnabled()) {
        logger.debug("Found jmx manager: " + p);
      }
    } else {
      if (logger.isDebugEnabled()) {
        logger.debug("Did not find a jmx manager");
      }
      result = new JmxManagerLocatorResponse();
    }
    return result;
  }

  private JmxManagerProfile startJmxManager(List willingToManage) {
    for (JmxManagerProfile p : willingToManage) {
      if (sendStartJmxManager(p.getDistributedMember())) {
        return p;
      }
    }
    return null;
  }

  private boolean sendStartJmxManager(InternalDistributedMember distributedMember) {
    try {
      ArrayList